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Question

These questions are based on the following set of numbers: 642875446355748

If in each number, all the digits are written in descending order, last digit of how many numbers thus formed will be a prime number?

A 1

B 2

C 3

D 4

E 5

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More Coded operation of nos Questions

In a certain code language, 'BYE’ is coded as '245' and 'OLA' is coded as '265'. How will 'CAR' be coded in that language?
Four groups of numbers are given out of which the numbers in three groups bear a certain common relationship. Choose the group in which the numbers are differently related.

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